. 2020 Feb 21;25(4):974. doi: 10.3390/molecules25040974
© 2020 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Scheme 4.
Synthesis of silylated precursors P2 and P3.